RefSense

RefSense is the name of both a web
interface to PubMed, and a set of command line tools for
accessing PubMed.
(Note: RefSense was previously distributed as 'Biblio'.)

The web
interface provides easy access to PubMed's data as well as some
useful tools not found at the actual PubMed site.

The command line tools allow you to search PubMed from a
terminal (such as
xterm),
retrieve web pages or PDFs, find related articles, convert to
BibTeX (convenient for LaTeX users), and much more by only using a keyboard. And you can get
convenient word completion on titles, author names, etc, as well!